Bug#250789: Please fix this bug!

[Recai Oktas <roktas@omu.edu.tr>]

* Denis Barbier [2004-07-24 22:51:00+0200]
[...]
> If termwrap is needed outside of d-i, I suggest to have a minimal
> termwrap-di to deal with Asian locales, and nothing more.

Eugeniy has once said that only those languages without a declared 
debian-installer/consoletype needed termwrap.  I've prepared proof of 
concept by using the idea.  Attached is the minimal implementation.  It 
doesn't behave according to the ENCODING, instead it first evaluates the 
CONSOLETYPE from  debian-installer/consoletype and only then it does 
something based on the ENCODING.  Following explains this idea:

	WRAPPER=""
	WRAPPER_OPTION=""

	CONSOLETYPE=$(get_db debian-installer/consoletype)
	ENCODING=$(locale charmap)

	case $CONSOLETYPE in
	kbd|cyr)
		# Nothing to do.
		;;
	*)
		case $ENCODING in
		eucJP|EUC-JP)
		[...]

Please note that this is only a draft, far from complete and untested.  
Now, could it be a base for further discussions?

-- 
roktas

#!/bin/sh
#
# Termwrap detects the type of terminal that it is run on, and the language
# the user is using, and sets up the terminal for that language. This is
# useful for languages (e.g., Japanese) where a special program is needed
# to display that language at the console.
#
# Termwrap is used to run programs including base-config on the
# second-stage install.
#
# This is really something of a hack, since once termwrap is done the user
# still gets a standard login prompt and is no longer shielded by
# termwrap.

######################################################################
##	Display usage if no argument.
######################################################################
if [ -z "$1" ]; then
	echo "usage: $0 [-nnt] <command> [...]"
	echo "-nnt: don't run another terminal"
	exit 0
fi

######################################################################
##	Some functions
######################################################################

# Get a variable from the debconf database of the first stage installer.
get_db () {
	DI_DB=/var/log/debian-installer/cdebconf/questions.dat
	if [ -e $DI_DB ]; then
		debconf-copydb d-i stdout -c Name:d-i -c Driver:File \
		               -c Filename:$DI_DB -c Name:stdout \
			       -c Driver:Pipe -c InFd:none \
			       --pattern="^$1$" | \
		grep ^Value: | cut -d ' ' -f 2
	fi
}

info() {
	echo "info: $@"
	logger -p user.info -t termwrap "info: $@"
}
warning() {
	echo "warning: $@"
	logger -p user.warning -t termwrap "warning: $@"
}
error() {
	echo "error: $@"
	logger -p user.crit -t termwrap "error: $@"
}

try_load_fb() {
	# Load framebuffer module (debian-installer/framebuffer value is null(not true!) or false.)
	if [ "$(get_db debian-installer/framebuffer)" != "false" ]; then
		case $(dpkg --print-installation-architecture) in 
		    i386)
			case $(uname -r) in
			2.6.*)
				(modprobe -q vesafb >/dev/null 2>&1 && modprobe -q fbcon >/dev/null 2>&1) || (modprobe -q vga16fb >/dev/null 2>&1 && modprobe -q fbcon >/dev/null 2>&1)
				;;
			*)
				modprobe -q vesafb >/dev/null 2>&1 || modprobe -q vga16fb >/dev/null 2>&1
				;;
			esac
                      ;;
		esac
	fi
}

######################################################################
##	Check the locale
######################################################################

# For this to work, the current locale must be valid.  The block
# generating the locale should have taken care of that.  If it isn't
# valid, the output is 'ANSI_X3.4-1968' (at least on my test machine
# 2002-02-09), and the case test below should unset both LANG and
# LOCALE

if [ -z "$LANG" ]; then
	echo "Locale is not set; aborting"
	exit 1
fi

if ! validlocale $LANG > /dev/null 2>&1; then
	echo "Locale \"$LANG\" is not valid; aborting"
	exit 1
fi

######################################################################
##	Recognize terminal type.
######################################################################
case `/usr/bin/tty` in
/dev/console)
	# Use fgconsole to detect if it is a serial console.
	if command -v fgconsole >/dev/null 2>&1 && [ serial = "$(fgconsole)" ] ; then
		TERMINAL=serial
	else
		TERMINAL=console
	fi

	# Or try another way, copied from d-i udeb rootskel.
	#case `readlink /proc/self/fd/0` in
	#        /dev/console)
	#		TERMINAL=serial
	#		;;
	#	*)
	#		TERMINAL=console
	#		;;
	#esac

	;;
/dev/tty|/dev/tty[1-9]*|/dev/vc/*)
	TERMINAL=console
	;;
/dev/tty[p-za-e]*|/dev/pts/*)
	TERMINAL=pseudo
	if [ ! -z "$DISPLAY" ]; then
		TERMINAL=x
	else
		case $TERM in
		rxvt|xterm*|kterm)	TERMINAL=x;;
		esac
	fi
	;;
/dev/tty[A-Z]*|/dev/cu*)
	TERMINAL=serial
	;;
esac

# If the default linux kernel TERM setting is used for serial consoles, change
# it to vt100.  This assume serial consoles understand vt100.  Almost
# all terminal programs can handle vt100.
if [ serial = "$TERMINAL" ] && [ linux = "$TERM" ] ; then
	TERM=vt100
fi

case $TERM in
dumb)	TERMINAL=dumb
esac

export TERMINAL

case $(dpkg --print-installation-architecture) in 
i386)	/bin/grep -q 9800 /proc/version && SUBARCH=pc9800 ;;
esac

######################################################################
##	Select suitable terminal as wrapper.
######################################################################
WRAPPER=""
WRAPPER_OPTION=""

CONSOLETYPE=$(get_db debian-installer/consoletype)
ENCODING=$(locale charmap)

case $CONSOLETYPE in
kbd|cyr)
	# Nothing to do.
	;;
*)
	case $ENCODING in
	eucJP|EUC-JP)
		# Japanese
		case $TERMINAL in
		x)
			WRAPPER="/usr/X11R6/bin/krxvt"
			WRAPPER_OPTION="-e"
			;;
		console)
			if [ "$SUBARCH" != pc9800 ] && [ "$TERMINAL" = console ]; then
				# Any platform except PC9800 require jfbterm
				# to display japanese fonts on console.
				try_load_fb
				WRAPPER="/usr/bin/jfbterm"
				WRAPPER_OPTION="-q -c other,EUC-JP,iconv,UTF-8 -e"
			fi
			;;
		# On pseudo and serial, we can't tell
		# if the terminal can display japanese fonts...
		esac
		;;
	*)
		# Fallback jfbterm
		# Mainly Korean, Chinese, Greek, Bulgarian
		case $TERMINAL in
		console)
			try_load_fb
			WRAPPER="/usr/bin/jfbterm"
			WRAPPER_OPTION="-q -c other,$ENCODING,iconv,UTF-8 -e"
			;;
		esac
		;;
	esac
esac

if [ "$1" = "-nnt" ]; then
	WRAPPER=""
	shift
fi

######################################################################
##	Execute Wrapper.
######################################################################
if [ ! -z "$WRAPPER" ] && [ -x "$WRAPPER" ]; then
	$WRAPPER $WRAPPER_OPTION /bin/true && exec $WRAPPER $WRAPPER_OPTION $@
fi

# Run the program.
$@

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